Sister's Slam Dunk

Episode 4 (2x4)

Air date: Mar 03, 2017

The members take a MBTI personality test which Kim Sook and Hong Jin-kyung took when they did the girl group project in season 1. Subsequently, they get a chance to listen to their new song, which was composed by Kim Hyeong-seok and written by lyricist Kim Eana, and vote which version of the song they would use. The members then meet Heo Kyung-hwan, Leeteuk and Red Velvet where they receive advice about idol's activities, such as deciding on Unnies' official greeting.